OBD tests -- will old codes (found) flunk my emissions test??
Thread Starter
Instructor
Joined: Sep 2003
Posts: 185
Likes: 0
From: gaithersburg MD
OBD tests -- will old codes (found) flunk my emissions test??
Had some earlier problems with 02 sensors which produced engine check codes. Haven't had any lately but will the OBD (state of Maryland) test pick up anything and fail me? Need to know what to expect!!!! 
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Burning Brakes
Joined: Jan 2002
Posts: 885
Likes: 0
From: The Woodlands Texas
Re: OBD tests -- will old codes (found) flunk my emissions test?? (HotLaperC5)
I've had the same problem. Was advised by the dealer that after 3 days of no codes you should be able to pass the emissions test. Did you clear all codes? The PCM and BCM store code related data for a specific period of time but I do not know for how long.
Good luck.
Good luck.
Racer
Joined: May 2000
Posts: 405
Likes: 1
From: Dallas
Re: OBD tests -- will old codes (found) flunk my emissions test?? (HotLaperC5)
If your check engine light is out, you should be OK.
Do not reset the PCM just before going in, or you will get too many emisions system "not ready" indications. A couple of days (two complete hot/cold cycles) are required for all of the test to execute after a reset.
Do not reset the PCM just before going in, or you will get too many emisions system "not ready" indications. A couple of days (two complete hot/cold cycles) are required for all of the test to execute after a reset.
